Wrap Directory.watch on linux for the watcher package.

pkg/watcher/test/ready_test.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:async';
-
-import 'package:scheduled_test/scheduled_test.dart';
-
-import 'utils.dart';
-
-main() {
-  initConfig();
-
-  setUp(createSandbox);
-
-  test('ready does not complete until after subscription', () {
-    var watcher = createWatcher(waitForReady: false);
-
-    var ready = false;
-    watcher.ready.then((_) {
-      ready = true;
-    });
-
-    // Should not be ready yet.
-    schedule(() {
-      expect(ready, isFalse);
-    });
-
-    // Subscribe to the events.
-    schedule(() {
-      var subscription = watcher.events.listen((event) {});
-
-      currentSchedule.onComplete.schedule(() {
-        subscription.cancel();
-      });
-    });
-
-    // Should eventually be ready.
-    schedule(() => watcher.ready);
-
-    schedule(() {
-      expect(ready, isTrue);
-    });
-  });
-
-  test('ready completes immediately when already ready', () {
-    var watcher = createWatcher(waitForReady: false);
-
-    // Subscribe to the events.
-    schedule(() {
-      var subscription = watcher.events.listen((event) {});
-
-      currentSchedule.onComplete.schedule(() {
-        subscription.cancel();
-      });
-    });
-
-    // Should eventually be ready.
-    schedule(() => watcher.ready);
-
-    // Now ready should be a future that immediately completes.
-    var ready = false;
-    schedule(() {
-      watcher.ready.then((_) {
-        ready = true;
-      });
-    });
-
-    schedule(() {
-      expect(ready, isTrue);
-    });
-  });
-
-  test('ready returns a future that does not complete after unsubscribing', () {
-    var watcher = createWatcher(waitForReady: false);
-
-    // Subscribe to the events.
-    var subscription;
-    schedule(() {
-      subscription = watcher.events.listen((event) {});
-    });
-
-    var ready = false;
-
-    // Wait until ready.
-    schedule(() => watcher.ready);
-
-    // Now unsubscribe.
-    schedule(() {
-      subscription.cancel();
-
-      // Track when it's ready again.
-      ready = false;
-      watcher.ready.then((_) {
-        ready = true;
-      });
-    });
-
-    // Should be back to not ready.
-    schedule(() {
-      expect(ready, isFalse);
-    });
-  });
-}